/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Attempt to remove a function from an interfaces list of function graphs. Note that this will NOT remove interface events (i.e. functions with no outputs)
True if the function was removed from the blueprint
static bool RemoveInterfaceFunction ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [FBPInterfaceDescription](API\Runtime\Engine\Engine\FBPInterfaceDescription) & Interface, [UFunction](API\Runtime\CoreUObject\UObject\UFunction) * Function, bool bPreserveFunction )